Advertisements
Advertisements
प्रश्न
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
Advertisements
उत्तर
Given:
Weight of the sodium = 4.6g
Mass of sodium atom = 23
Number of gram moles of Na = `"Mass of Sodium"/"Mass of sodium atom"`
= `4.6/23` = 0.2g
Molar mass of CuSO4.5H2O = ( 64 ) + ( 32 ) + (9 x 16) + (10 x 1) = 250
Molar mass of 5.H2O molecules = ( 10 x 1) + ( 5 x 16) = 90
Percentage of water of Crystallisation = `[ 90 xx 100]/250` = 36%
APPEARS IN
संबंधित प्रश्न
Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?
Calculate the molar mass of the following substance:
Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10-12 g. Calculate the number of carbon atoms in the signature.
Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at STP) is required to completely reduce 120g of copper oxide? The equation for the reaction is :
3CuO + 2NH3 → 3Cu + 3H2O + N2
Define the term:
Relative molecular mass
Calculate the mass of 0.1 mole of the following:
CaCl2
(Ca = 40, Na=23, Mg =24, S=32, C = 12, Cl = 35.5, O=16, H=1)
A student puts his signature with a graphite pencil. If the mass of carbon in the signature is 10-12 g, calculate the number of carbon atoms in the signature.
Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
\[\ce{CaCl2} (aq) → {Ca^{2+} (aq) + 2{Cl}- (aq)}\]
Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.
Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight.
- Whose container is heavier?
- Whose container has more number of atoms?
Deduce the number of molecules of the following compound in the given quantity.
8.8g carbon dioxide
